Home / 2,987.70-4,121.94-1,808.34

Finding the Fourth Proportional to 2,987.70, 4,121.94 and 1,808.34

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Solution

The fourth proportional to 2,987.70, 4,121.94 and 1,808.34 is: 2,494.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.70 : 4,121.94 = 1,808.34 : x
  2. Step 2: Convert to fraction form
    2,987.70/4,121.94 = 1,808.34/x
  3. Step 3: Cross multiply
    2,987.70x = 4,121.94 × 1,808.34
  4. Step 4: Simplify right side
    2,987.70x = 7,453,868.98
  5. Step 5: Solve for x
    x = 7,453,868.98/2,987.70
  6. Step 6: Final answer
    x = 2,494.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.